barack obama came to the u.n. primarily, of course, as president, but also as a candidate in a tough reelection fight. president obama aimed his u.n. speech at american voters and at most muslims who he said do not hate. >> i would like to begin today by telling you about an american named chris stevens. >> reporter: the u.s. diplomat who loved libya, but who was murdered there. his u.s. consulate in benghazi burned. >> there are no words that excuse the killing of innocents. there is no video that justifies an attack on an embassy. >> reporter: there was no sympathy from the president. but he called for a deeper look into the root causes of anti-u.s. muslim rioting, and demanded that muslim leaders do more now. >> it is time to marginalize those who even when not directly resorting to violence use hatred of mercator west or israel as the central organizing prine iie of politics. >> reporter: iran's president, ahmadinejad yesterday called for the elimination of israel. >> make no mistake, a nuclear armed iran is n